Schema:
Customers (customer_id, customer_name, customer_details)
Invoices (invoice_number, invoice_date, invoice_details)
Orders (order_id, customer_id, order_status, date_order_placed, order_details)
Products (product_id, product_name, product_details)
Order_Items (order_item_id, product_id, order_id, order_item_status, order_item_details)
Shipments (shipment_id, order_id, invoice_number, shipment_tracking_number, shipment_date, other_shipment_details)
Shipment_Items (shipment_id, order_item_id)
Please answer with SQL.